Stability analysis and parameter optimization on the rock mass  in Jiuzhanggou gold mine

In order to study the stability analysis method and parameter optimization for the upward drift stope，several indexes representing the engineering quality of rock mass in mines were acquired by the survey of engineering geology，digital photographic，the orebearing rock mechanics experiments etc in Jiuzhanggou gold mineThe 3D digital measurement system（ShapeMetrix3D） is employed to survey and collect the digital information of the plane parameters of rockmass structures that including rock mass occurrence，joint spacing，joint set numbers，volume density of structural plane for 100 m stope at Jiuzhanggou gold mineBased on the digital joint structure characteristics，the RMR system and Qsystem are employed to analyze and classify the stability of stope rockmass，incorperating with drilling peep results and rock mechanics parametersAccording to the acquired indexes，the current span of the testing stope is optimized by using the Mathews stability graph methodIt is concluded that the span of the stope should be strictly controlled below 75 m in order to ensure the stability of stope